The City of Grinnell provides 5/8 inch meters. It is up to the property owner to purchase any meter larger than 5/8 inch. See City Code, Chapter 91.06. The city is sole owner of all water meters. It is the property owner's responsibility that the meter does not freeze or become damaged. On all new gallon meters there is a leak detector. It is the red triangle in the center of the top of the meter. It should not be turning unless something or someone is using water at the time. If it is indicating usage when there should not be any, you should call your plumber immediately to find the source of the leak.